问个跨领域的问题啊（钢结构问题）？

假设一个钢平台四根柱子，<img id="aimg_gZs7s"  class="zoom" file="http://data:image/png;base64,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"  lazyloadthumb="1" border="0" alt="" />,平台占地5*5=25平米，平台自重10吨，承载100吨，假设当地设防烈度7级，及速度0.1g，我想知道地面承载怎么计算，需要考虑哪些因素。各位坛友帮个忙，是不是考虑（10+100）/25，就是平均静载荷，我感觉不对，欢迎指教。。。

推荐一本书《钢结构设计手册》。
里面有专门的章节，介绍钢平台的设计和计算。

像这种平台4根柱子一般用钢筋混凝土独立基础，基础顶面预埋钢板，钢柱与预埋件焊接组成。如承载100吨属于运转设备类，还需考虑动荷载系数，因100吨仅属于静荷载。在空间允许的情况下，柱与柱之间要用斜支撑，以减少柱的造价。地面承载能力涉及到工程地质，可向当地建筑部门咨询；此外还牵涉到当地最大冻土深度。